*{
  margin: 0;
}

body{
	max-width:640px;
	min-width:300px;
	margin: 0 auto;
	background-color: #F2F2F2;
}

.r{
	position:fixed; 
	bottom:0;
	max-width:640px;
	min-width:300px;
	width:100%;
	line-height: 48px;
	margin: 0px;
	padding: 0px;
	z-index:9999;
	background-color: #FFFFFF;
}

.navbom{
	display: inline;
	float: left;
	width: 49%;
	height: 100%;
	text-align: center;
	font-size: 16px;
	padding: 0px;
	margin: 0px;
}